Another point that modelers of these cars often overlook is that they
retained their original Bx-11 and Bx-12 numbers from the time they
were rebuilt in 1941-'44 through World War II and didn't begin to get
renumbered into the 210000-211049 (Bx-11) and 2211051-214549 (Bx-12)
series until the late 1940s. This fact isn't widely known because
almost all of the extant photos of the cars were taken in the late
'50s and '60s, long after they were renumbered.

Richard Hendrickson